csr867x source这段代码怎么理解？

951623847

第一次开机进入idle模式，此时delay的初始值为0，且pskey ps_timers对应的值也为0，也就是delay==0，怎么进入的APP_ENTER_PAIRING_STATE_FROM_IDLE, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE？

1.     if (delay != 0)
   
2.     {
   
3.         /* enter connectable or discoverable state if a delay has been configured */
   
4.         if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device) || theSource->inquiry_mode.force_inquiry_mode)
   
5.         {
   
6.             /* no device to connect to, go discoverable */
   
7.             MessageSend(&theSource->app_data.appTask, APP_ENTER_PAIRING_STATE_FROM_IDLE, 0);
   
8.         }
   
9.         else
   
10.         {
    
11.             /* there is a device to connect to, go connectable */
    
12.             MessageSend(&theSource->app_data.appTask, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE, 0);
    
13.         }
    
14.     }

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完整代码地方，

1. static void states_enter_state_idle(SOURCE_STATE_T old_state)
   
2. {
   
3.     uint16 delay = 0; /* default is to have no delay before next connection attempt */
   
4. 
   
5.     switch (old_state)
   
6.     {
   
7.         case SOURCE_STATE_CONNECTING:
   
8.         {
   
9.             if (theSource->ps_config->features.connection_max_retries != INVALID_VALUE)
   
10.             {
    
11.                 /* feature enabled to only try to a remote device a set number of times before giving up */
    
12.                 if ((theSource->connection_data.connection_retries < theSource->ps_config->features.connection_max_retries) ||
    
13.                     theSource->timer_data.timers_stopped)
    
14.                 {
    
15.                     /* if it was connnecting use the connection_idle_timer delay before next connection attempt */
    
16.                     delay = theSource->ps_config->ps_timers.connection_idle_timer;
    
17.                     STATES_DEBUG(("STATE: was connecting, connection attempts:[%d], can continue after delay:[%d secs]\n", theSource->connection_data.connection_retries, delay));
    
18.                     
    
19.                     if (!theSource->timer_data.timers_stopped)
    
20.                     {
    
21.                         /* increase number of connections attempted if timers haven't been bypassed */
    
22.                         theSource->connection_data.connection_retries++;
    
23.                     }
    
24.                 }
    
25.                 else
    
26.                 {
    
27.                     /* configured number of connection attempts have been tried - give up connecting! */
    
28.                     delay = TIMER_NO_TIMEOUT;
    
29.                     theSource->connection_data.connection_retries = 0;
    
30.                     STATES_DEBUG(("STATE: was connecting, given up trying to connect\n"));
    
31.                 }
    
32.             }
    
33.             else
    
34.             {
    
35.                 /* if it was connnecting use the connection_idle_timer delay before next connection attempt */
    
36.                 delay = theSource->ps_config->ps_timers.connection_idle_timer;
    
37.                 STATES_DEBUG(("STATE: was connecting, next connect delay:[%d secs]\n", delay));
    
38.             }
    
39.         }
    
40.         break;
    
41.         
    
42.         case SOURCE_STATE_CONNECTED:
    
43.         {
    
44.             /* if it was connnected use the disconnect_idle_timer delay before next connection attempt */
    
45.             delay = theSource->ps_config->ps_timers.disconnect_idle_timer;
    
46.             STATES_DEBUG(("STATE: was connected, delay:[%d secs]\n", delay));
    
47.         }
    
48.         break;
    
49.         
    
50.         case SOURCE_STATE_INITIALISING:
    
51.         case SOURCE_STATE_POWERED_OFF:
    
52.         {
    
53.             if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device))
    
54.             {
    
55.                 /* if the device was powered off and no previous connection exists:
    
56.                     use the power_on_discover_idle_timer before first discovery attempt */
    
57.                 delay = theSource->ps_config->ps_timers.power_on_discover_idle_timer;
    
58.             }
    
59.             else
    
60.             {
    
61.                 /* if the device was powered off and a previous connection exists:
    
62.                     use the power_on_connect_idle_timer before first connection attempt */
    
63.                 delay = theSource->ps_config->ps_timers.power_on_connect_idle_timer;
    
64.             }
    
65.         }
    
66.         break;
    
67.         
    
68.         default:
    
69.         {
    
70.             
    
71.         }
    
72.         break;            
    
73.     }
    
74.    
    
75.     if (old_state != SOURCE_STATE_CONNECTING)
    
76.     {
    
77.         /* reset connection attempts if not currently connecting */
    
78.         theSource->connection_data.connection_retries = 0;
    
79.     }
    
80.    
    
81.     if (delay != 0)
    
82.     {
    
83.         /* enter connectable or discoverable state if a delay has been configured */
    
84.         if (BdaddrIsZero(&theSource->ps_config->bdaddr_remote_device) || theSource->inquiry_mode.force_inquiry_mode)
    
85.         {
    
86.             /* no device to connect to, go discoverable */
    
87.             MessageSend(&theSource->app_data.appTask, APP_ENTER_PAIRING_STATE_FROM_IDLE, 0);
    
88.         }
    
89.         else
    
90.         {
    
91.             /* there is a device to connect to, go connectable */
    
92.             MessageSend(&theSource->app_data.appTask, APP_ENTER_CONNECTABLE_STATE_FROM_IDLE, 0);
    
93.         }
    
94.     }
    
95. 
    
96.     if (delay != TIMER_NO_TIMEOUT)
    
97.     {
    
98.         STATES_DEBUG(("STATE: IDLE delay before next connection:[%d secs]\n", delay));      
    
99.         /* initialise the connection with the connection manager */
    
100.         connection_mgr_start_connection_attempt(NULL, AGHFP_PROFILE_IS_ENABLED ? PROFILE_AGHFP : PROFILE_A2DP, delay);        
     
101.     }
     
102.     else
     
103.     {
     
104.         STATES_DEBUG(("STATE: No auto reconnection\n"));
     
105.     }
     
106. }

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951623847

看到了，这里面执行的。

1. MessageSendLater(app_get_instance(), APP_CONNECT_REQ, message, D_SEC(delay));

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1. static void app_connect_req(const APP_CONNECT_REQ_T *message)
   
2. {
   
3.     APP_MSG_DEBUG(("APP_MSG: app_connect_req\n"));
   
4. 
   
5.     /* cancel any other connection requests as they may come from user or be automatically generated */
   
6.     MessageCancelAll(app_get_instance(), APP_CONNECT_REQ);
   
7.    
   
8.     switch (states_get_state())
   
9.     {
   
10.         case SOURCE_STATE_IDLE:
    
11.         case SOURCE_STATE_CONNECTABLE:
    
12.         case SOURCE_STATE_DISCOVERABLE:
    
13.         case SOURCE_STATE_INQUIRING: /* connect after device found through inquiry */
    
14.         case SOURCE_STATE_CONNECTING: /* this will occur when trying to connect further profiles - re-enter state to kick connection */
    
15.         case SOURCE_STATE_CONNECTED:
    
16.         {
    
17.             /* suspend any active audio */
    
18.             MessageSend(app_get_instance(), APP_AUDIO_SUSPEND, 0);
    
19.             /* connect to remote device */
    
20.             if (BdaddrIsZero(connection_mgr_get_remote_address()) || message->force_inquiry_mode)
    
21.             {               
    
22.                 states_set_state(SOURCE_STATE_INQUIRING);
    
23.             }
    
24.             else
    
25.             {               
    
26.                 states_set_state(SOURCE_STATE_CONNECTING);              
    
27.             }
    
28.         }
    
29.         break;
    
30.                
    
31.         default:
    
32.         {
    
33.             app_msg_unhandled_state();
    
34.         }
    
35.         break;
    
36.     }
    
37. }

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忙忙碌碌

完整代码states_enter_state_idle中的if (delay != 0)代码：

1，如果从关机状态 开机 进入idle模式，如果 delay不等于0，那么执行以下内容：
2，如果无已连接设备记录BdaddrIsZero或者处于强制进入配对模式，那么发送消息APP_ENTER_PAIRING_STATE_FROM_IDLE；否则发送消息APP_ENTER_CONNECTABLE_STATE_FROM_IDLE